8Tx Uplink Precoder Codebook Mapping With Lower Signaling Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges with large overheads due to the number of candidate codebooks for multiple transmit/receive antennas, particularly in 5G systems with 8Tx, and unclear bit size determination for precoder indications, which affect uplink quality.
Innovation Solution
Implementing methods to reduce the number of candidate codebooks and determine bit sizes by configuring coherent levels or number of port groups, using joint-coded indications, and applying group-balancing and group-selection rules to optimize precoder indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of candidate codebooks is increased to support multiple transmit antennas, then the coverage and capability of wireless communication systems is improved, but the overhead increases
Solution Approach 1:
The patent segments the codebook selection process by dividing antennas into port groups and using separate indication fields for different ranks associated with each port group. This segmentation allows the system to support multiple transmit antennas while reducing overall overhead by selectively indicating only the necessary precoding information for each group rather than treating all antennas uniformly.
Solution Approach 2:
The patent implements dynamic adaptation by allowing the network to configure different numbers of port groups and ranks based on channel conditions and traffic requirements. The system can dynamically adjust the precoder indication format and the number of candidate codebooks needed, optimizing the balance between coverage capability and overhead in real-time operating conditions.
2Measurement precision
If the bit size for precoder indications is increased to improve precision, then the accuracy of precoder selection is improved, but the overhead increases
Solution Approach 1:
The patent changes the parameter structure by introducing rank-specific indication fields where different bit sizes are used for different ranks. Instead of using a fixed large bit size for all cases, the system adjusts the precision of precoder indications based on the specific rank and port group configuration, maintaining accuracy where needed while reducing overhead in other scenarios.
Solution Approach 2:
The patent applies local quality by using different precision levels for different parts of the precoder indication. Each port group and rank combination can have tailored indication fields with appropriate bit sizes, ensuring high precision for critical precoder selections while using coarser indications for less critical parameters, thereby optimizing the overall accuracy-overhead trade-off.
3Productivity
If the number of port groups and ranks is increased to support complex transmissions, then the productivity of wireless communication is improved, but the device complexity increases
Solution Approach 1:
The patent segments the complex transmission system into multiple port groups, each with associated ranks and precoding matrices. This segmentation allows the system to manage complexity by handling each group independently with dedicated indication fields, making the overall complex transmission manageable through modular organization of ports, ranks, and precoders.
Solution Approach 2:
The patent enables dynamic configuration of port groups and ranks based on traffic demands and channel conditions. The network can adaptively adjust the number of active port groups and their associated ranks, allowing the system to scale productivity up or down as needed without being locked into a fixed complex configuration, thereby managing device complexity through flexible adaptation.
Data Source
AI summary
The New Radio (NR) technology of Fifth Generation (5G) wireless communication systems is configured to use multiple transmit/receive antennas to provide increased throughput and lower error rates. Embodiments of the disclosed technology are directed to configuring the uplink 8Tx candidate codebooks. In an example, the bit size and the mapping of the precoder indication are based on one or more parameters associated with capability or configuration of the wireless user equipment (UE). An example method of wireless communication includes receiving, by a wireless device from a network node, a precoder indication, and determining, based on the precoder indication, a precoder for a transmission, wherein the precoder indication indicates at least one of a number of port groups, one or more ranks, or one or more precoding information, each precoding information associated with a rank of the one or more ranks.